<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
        <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
            <el-table-column type="expand">
                <template v-slot="scope">
                    <el-row :class="['bdbottom',i1 === 0 ? 'bdtop' : '','vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                        <!-- 渲染一级权限 -->
                        <el-col :span="5">
                        <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                        <i class="el-icon-caret-right"></i>
                        </el-col>
                        <!-- 渲染二级和三级权限 -->
                        <el-col :span="19">
                            <!-- 通过 for 循环 嵌套渲染二级权限 -->
                        <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                            <el-col :span="6">
                                <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <el-col :span="18">
                                <el-tag type="warning" v-for="(item3, i3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">
                                {{item3.authName}}</el-tag>
                            </el-col>
                        </el-row>
                        </el-col>
                    </el-row>

                    <!-- 代码结构 -->
                    <!-- <pre>
                    {{scope.row}}
                    </pre> -->
                </template>
            </el-table-column>
                <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" width="300px">
                    <template v-slot="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.id)">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeUserById(scope.row.id)">删除</el-button>
                    <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog title="分配权限" :visible.sync="setRightDialogVisible"
        width="50%" @close="setRightDialogClosed">
        <!-- 树形控件 -->
        <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
        <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消
            </el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 所有角色列表数据
            rolelist: [],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 所有权限的数据
            rightslist: [],
            // 树形控件的绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            // 默认选中的节点Id值数组
            defKeys: [],
            // 当前即将分配权限的角色id
            roleId: ''
        };
    },
    created() {
        this.getRoleList()
    },
    methods: {
        async getRoleList() {
            const {data: res} = await this.$http.get('roles')
            
            if(res.meta.status !== 200) {
                return this.$message.error('获取角色列表失败！')
            }

            this.rolelist = res.data

            console.log(this.rolelist);
        },
        // 根据id提示删除对应的权限
        async removeRightById(role,rightId) {
            // 弹框提示用户是否要删除
            const confirmResult = await
            this.$confirm('此操作将永久删除该文件，是否继续？','提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }).catch(err => err)

                if(confirmResult !== 'confirm') {
                    return this.$message.info('取消了删除!')
                } 
                const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

                if(res.meta.status !== 200) {
                    return this.$message.error('删除权限失败！')
                }
                // this.getRolesList() --》 会导致重载把页面合起来
                //防止当前页面的刷新，提升用户体验感
                role.children = res.data
        },


        // 展示分配权限的对话框
        async showSetRightDialog(role) {
            this.roleId = role.id
            // 获取所有权限的数据
            const {data: res} = await this.$http.get('rights/tree')

            if(res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败！')
            }
            // 把获取到的权限数据保存到 data 中
            this.rightslist = res.data
            console.log(this.rightslist);

            // 递归获取三级节点的Id
            this.getLeafKeys(role,
            this.defKeys)

            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有三级权限的id，并保存到 defKeys 数组中
        getLeafKeys(node,arr) {
            // 如果当前 node 节点不包含 children 属性，则是三级节点
            if(!node.children) {
                return arr.push(node.id)
            }

            node.children.forEach(item => 
            this.getLeafKeys(item,arr))
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defKeys = []
        },
        // 点击为角色分配权限
        async allotRights() {
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]

            // console.log(Keys);

            const idStr = keys.join(',')

            const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids: idStr})

            if(res.meta.status !== 200) {
                return error.$message.error('分配权限失败！')
            }

            this.$message.success('分配权限成功！')
            this.getRoleList()
            this.setRightDialogVisible = false
        }
    },
};
</script>

<style lang="less" scoped>
.el-tag {
    margin: 7px;
}

.bdtop {
    border-top: 1px solid #eee;
}

.bdbottom {
    border-bottom: 1px solid #eee;
}

.vcenter {
    display: flex;
    align-items: center;
}
</style>